1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2745d9779b27c242c5f4519151c2b68664721b6559d3d33b7f2522cac524e64. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e265fd31-8a0a-4163-a3e5-2aaf9b72e90d.json and https://artists.proofprofile.net/proofs/artist/e265fd31-8a0a-4163-a3e5-2aaf9b72e90d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc1a6a4b2c30d10bb95e1bbb369180a2dc5bd07efe2349e74802bc16208bd70. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS662125159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f90b0b2ec972b4fa880d62e79711d1170d98a4b08c3c9bff3e32e6053964b52. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTH82181055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bd562f40a1291b6f9be8e6d0da27ccb81b8f773cd8ed9b14385dcd613a6520. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAHQJ2343471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebab7dd8dc0efc1e0db713c0cd5014139878ccdb05519d6d270e6b5e6173e944. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CACWV2317176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b34b2493c38436a6641df95cd9d6e73640b5c7c3eed40ec5f210184cf40a4a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CACWV2382707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e793aa27fd00c665f07b25c52f8c7e10cc869fbcb495cb48d6a0f2f85e258d. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAENV2392673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6fdeeae6915123ed6ff1d70b4ca881f10489197540db19196a69357fe516d63. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAGOO2360046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85662eaf275787da9954200aa2d3907ff1c20a4774bdc13627dafc9cf15a3ae0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAHQJ2437085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bfbd4fd1197cf1157c8b1986a1e4f621237db27372efd686de2cefd7ea79380. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAHQJ2491334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99341d698dcd1e798769dd728a610c3b170198c930951796b890e714300d1e07. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CACWV2458364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b35c58afa59ad4c9016c683d0d8fed0c15ca72119ed0bfb58b973360c4ff88d. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CALVP2437349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d87b7ba414aed055b936101f2f03346444e08d3138474c632633391453c7b2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CBF8B2418742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97064040459e518616f2c2a73b920da248401b2bc660f6743ffbc6eed0682bb8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CACWV2529901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd3d8ef194f95b78580082d366ff282e83743bf624f655f84adf356f8a62dbe. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CACWV2588478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960bb9ac49616f76d66b33f4e7753a031cb4082fb45c2721c1bf903581cc7c26. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CALVP2535707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c22905d82b9a0a4e77888ea953f9c56cd25c2018f932c345b71f9c6873832c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CBEYJ2582987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1415b8942b42d6ca40d08eacb3cef455b70468d7c0ecaebfaa9d1413a881a612. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CBF8B2500757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0be87f776deb1096a882c7779a211823d3367adb47678e1834cd5db548bd721. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ62436155.